Automatic door-opener



No. 6|2,324. Patented Oct. ll, I898. W. H. FRAZIER &. C. M. EINFELDT.

AUTOMATIC DOOR OPENER.

(Application filed N ov. 15, 1am.

(No Model.) 2 Sheets-Sheet l.

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N0. 6l2,324. Patented Oct. ll, I898. W. H. FBAZIER 81.0. M. EINFELDT.

AUTOMATIC DOOR OPENER.

(Application filed Nov. 15, 1897.) (\No Model.) 2 Sheets-Sheet 2.

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UNITED STATES PATENT OFFICE.

IVILLIAM H. FRAZIER AND CHARLES M. EINFELDT, OF DENVER, COLORADO.

AUTOMATIC DOOR-OPEN ER.

SPECIFICATION forming part of Letters Patent No. 612,324, dated October11, 18 98.

Application filed November 15,1897. Serial No. 658,573. (No model.)

To all whom it may concern:

Be it known that we, WILLIAM H. FRAZIER and (humans M. EINFELDT,citizens of the United States, residing at Denver, in the county ofArapahoe and State of Colorado, have invented certain new and usefulImprovements in Automatic Door-Openers, of which the following is afull, clear, and exact description, reference being had to theaccompanying drawings, forming a part of this specification.

The object of our invention is to provide an improved device which willautomatically open and close a door. It requires no hand manipulation toeffect this result, but the object is accomplished by electric andhydraulic force, made active by the person passing through the doorwaystepping on a mat, which completes an electric circuit.

The invention possesses features of novelty hereinafter specificallypointed out and claimed.

Referring to the drawings, which form a part of this specification,Figure I shows a front elevation of two doors furnished with ourimprovement and showing also the electric device for controlling thefluid which operates the doors. Fig. II is an enlarged detail view,taken partly in vertical section, of the magnet or solenoid. Fig. III isan enlarged detail view of a door-operating cylinder and air-cushion,taken 011 the line'III III, Fig. V. Fig. IV is a vertical section of theelectric contact-mat which is placed in front of a door. Fig. V is a topview of the attachments placed on the top of the doors.

and the door-casing.

1 is the door frame or casing, and 2 and 3 are doors therein closingagainst a central upright 1 and opening in opposite directions. In frontof these doors on the side opposite that to which they open and placedat a convenient distance therefrom is an electric mat 4, which when aweight is thereon completes a circuit by reason of the contactcorrugations 5.

6 (3 are wires leading from a battery or dynamo to magnet 8, and 7 is awire connecting the mat 4 with a plate 11. This magnet has a slidingcore 9, provided with a spur 10,

- adapted to contact with the plate 11, the circuit being completed bymeans of the wire 12.

hen the circuit is completed and the current turned on, as described,the core 9 is drawn to the right away from the position shown in Fig.II. This movement allows water, under the pressure of the city main orotherwise, to pass through a supply-pipe 13, whose opening is nowcoincident with a port 14: in a valve 15. This hollow valve is dividedinto two chambers by the partition 16. Secured to the top of thevalve-casing 17 is a reservoir 18, which opens into the valve-chambers.It is supplied with a glass gage 19 and discharges into a pipe 20. Thispipe 20 leads to acylinder 21 and the contents press against a piston22, which is located in a large cylinder 23. A valve 24:, having twoseats 25 and 26 and supplied with coiled spring-cushions 27 and 28,controls the pistons movement. An air-chamber 29 further cushions thisaction. Attached to the other side of the piston is a rod 30, which islinked to an arm 31, which is rigid with an arm 32 and held in positionshown in Fig. V by the spring 33. These arms are mounted on a rock-shaft34. The connection with the door 2 is made through the medium of thelink 35.

We prefer to fill the reservoir 18 with oil, as it is lighter thanwater. When the device is operated by reason of the current ofelectricity being turned on, as described, the water-pressure forces theoil up in the pipe 20 and forces the piston back, which by means of thearms described opens the door. It remains open until a second electricmat is stepped upon, which renders active the magnet 8 and draws thevalve 15 back to allow the right-hand ports to come under the openingfrom the reservoir 18. This releases the pressure from the piston 22,allowing the water to flow out of the discharge-pipe 36, which is madewith a loop extending to the height of the cylinder 23 for the purposeof allowing no more water to escape than is displaced by the piston 22and to prevent siphoning oil from the reservoir 18. It will be readilyseen that the quantity of water used each time the door is opened isequal to this displacement and that the oil is used over and over again.

37 is a guard hinged to the door-frame l at 38, which serves the purposeof preventing a person from attempting to open the door 3 away fromhimself. It serves to direct a person to the right door. The doors,however, should be constructed to swing in but one direction, so thatthis guard 37 is not really necessary. 1

39 are the brackets, by means of which th cylinder and accompanyingparts-are secured to the door-frame 1.

40 is the bracket secured to the same frame on which the arms 31 and 32are hung.

41 is a standard which supports the valve and magnets with theirmechanism, which need not necessarily be put under the floor, as shown.They may be located at any convenient place, as all that is necessary isthat the door 2 swing clear of the pipe 20. As shown, the pipe 20 issupported on an upright 1 between the two doors instead of the doorsmeeting in the usual way.

The advantages possessed by this device are manifold, but it isespecially useful in hotels and restaurants, where the communicationbetween dining-rooms and kitchens is necessarily kept closed and wherewaiters passing to and fro have heavy trays to carry, which prevents theuse of their hands. Our

device provides a means whereby such doors are automatically opened andclosed and without any use of the hands whatever.

'What we claim, and desire to secure by Letters Patentof the UnitedStates, is

1. The combination'of a double-chambered valve, solenoids situated oneither side of said valve, a means for automatically controlling saidsolenoids, a pipe in intermittent communication with one of saidvalve-chambers and leading from a source of water-supply, anexhaust-pipe leading from the other of said valve-chambers, and anoperating-cylinder in alternate communication with said valve-chambers,substantially as described.

2. The combination of a double-chambered valve, solenoids situated oneither side of said valve, a means for automatically controlling saidsolenoids, a pipe in intermittent communication with one of saidvalve-chambers, and leading from a source of water-supply, anexhaust-pipe leading from the other of said valve-chambers, anoperating-cylinder in alternate communication with said valvechambers,and an interposed oil-reservoir; substantially as described.

M. H. FRAZIER. CHARLES M. EINFELDT. In presence of- ELMER E. FLAMBOE,WM. H. J ONES.

